diff --git a/test/test262.js b/test/test262.js
index 12e31a8927..b8b8f8cb3d 100644
--- a/test/test262.js
+++ b/test/test262.js
@@ -1,4 +1,4 @@
-if (process.env.SIMPLE_6TO5_TESTS || process.env.running_under_istanbul) return;
+if (process.env.SIMPLE_6TO5_TESTS) return;
 
 var transform = require("../lib/6to5/transformation/transform");
 var readdir   = require("fs-readdir-recursive");